html,
body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.title {
    text-align: center;
    padding-bottom: 1vh;
}

.content-box {
    display: flex;
    justify-content: space-evenly;
    height: 60%;
    margin: 30px;
}

.coat {
    flex-shrink: 0;
    width: 60%;
    box-sizing: border-box;
    padding: 3%;
    box-shadow: 7px 8px 20px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.online-people {
    flex-shrink: 0;
    width: 20%;
    box-shadow: 7px 8px 20px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    padding-bottom: 20px;
    overflow: hidden;
    user-select: none;
}

.online-people h2 {
    flex-shrink: 0;
    text-align: center;
}

.online-people .online-list {
    flex-grow: 1;
    flex-shrink: 0;
    margin: 0;
    padding: 0;
    overflow: auto;
    height: 0;
}

.online-people .online-list::-webkit-scrollbar {
    width: 5px;
}

.online-people .online-list::-webkit-scrollbar-track {
    background-color: #f0f0f0;
    border-radius: 25px;
}

.online-people .online-list::-webkit-scrollbar-thumb {
    background: #4e4e4e;
    border-radius: 25px;
}

.online-people .online-list li {
    box-sizing: border-box;
    padding: 0 5%;
    margin: 5% 0;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-content {
    width: 100%;
    height: 100%;
    overflow: auto;
    padding: 0;
    margin: 0;
}

.chat-content::-webkit-scrollbar {
    width: 5px;
}

.chat-content::-webkit-scrollbar-track {
    background-color: #f0f0f0;
    border-radius: 25px;
}

.chat-content::-webkit-scrollbar-thumb {
    background: #4e4e4e;
    border-radius: 25px;
}

.chat-content li {
    margin: 0;
    margin-bottom: 10px;
    display: flex;
}

.chat-content li span:first-child {
    max-width: 150px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: bold;
    font-size: 18px;
}

.footer{
    width: 80%;
    margin: 0 auto;

}

textarea{
    width: 100%;
    height: 150px;
    resize:none;
}
.system-info span{
    font-size: 12px;
    color: #000;
    text-align: center;
}